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Elimination Reactions of Alkyl Halides

1,2-Dibromopr...

Question

1,2-Dibromopropane on treatment with X moles of $N a N H_{2}$ followed by treatment with $C_{2} H_{5} B r$ gives a pentyne. The value of X is:

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Solution

Only 3 moles of $N a N H_{2}$ will be required.
Reaction will proceed as follows:

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